Pulleys are used to transmit power between shafts using belts or ropes. They are typically made of materials like cast iron, steel, or aluminum. Pulleys consist of a central hub that mounts onto a shaft, arms that connect the hub to an outer rim, and a rim that carries the belt or rope. Different types of pulleys include solid pulleys, split pulleys, stepped/cone pulleys, fast/loose pulleys, jockey pulleys, and grooved pulleys. Chain drives are also used to transmit power between shafts and offer higher efficiency than belt drives, though they require more precise shaft alignment. Friction drives can be used for transmitting power between parallel or intersecting shafts over short